Creamy Nigella Potato Gratin (Printable view)
Layered potatoes baked in creamy milk and cream, infused with aromatic nigella seeds, garlic, and nutmeg, topped with golden melted Gruyère cheese.
# What You'll Need:
→ Vegetables
01 - 2.5 lbs starchy potatoes, peeled and thinly sliced
02 - 1 medium onion, finely sliced
→ Dairy & Cream
03 - 1 ½ cups heavy cream
04 - ¾ cup plus 1 tablespoon whole milk
05 - 1 cup grated Gruyère cheese
06 - 2 tablespoons unsalted butter
→ Spices & Aromatics
07 - 2 teaspoons nigella seeds
08 - 2 cloves garlic, minced
09 - ½ teaspoon ground nutmeg
10 - 1 teaspoon salt
11 - ½ teaspoon black pepper
# Steps:
01 - Preheat oven to 375°F. Grease a 9x13 inch baking dish generously with butter.
02 - Arrange half of the sliced potatoes in the prepared dish, overlapping them slightly. Scatter half the onions, half the minced garlic, 1 teaspoon of nigella seeds, and half of the salt, pepper, and nutmeg over the potatoes.
03 - Layer the remaining potatoes and onions on top. Season with the remaining garlic, nigella seeds, salt, pepper, and nutmeg, distributing evenly.
04 - Whisk the heavy cream and whole milk together in a bowl, then pour the mixture evenly over the layered potatoes. Dot the surface with small pieces of the butter.
05 - Cover the dish tightly with aluminum foil and bake for 40 minutes until the potatoes are nearly tender when pierced with a knife.
06 - Remove the foil and sprinkle the Gruyère cheese evenly across the top. Return to the oven uncovered for an additional 20 minutes until the cheese is golden brown and bubbling.
07 - Allow the gratin to rest for 10 minutes before serving so the cream sauce sets and layers hold together.
# Expert Advice:
01 -
- The nigella seeds add a warm, unexpected depth without overpowering the creamy potato base you already crave.
- It reheats beautifully the next day, which means you can make it ahead and actually enjoy your own dinner party.
02 -
- Slice the potatoes uniformly thin or some will turn to mush while others stay stubbornly crisp, a lesson I learned the hard way with a lopsided disaster.
- Infusing the milk with a bay leaf for ten minutes before mixing it with the cream adds a subtle savory note that people will notice but never pinpoint.
03 -
- Taste the cream mixture before pouring and adjust the salt, because potatoes absorb seasoning like sponges and an underseasoned gratin tastes flat no matter how much cheese you pile on top.
- The nigella seeds should go between the layers, not just on top, because their flavor blooms in the steam and cream rather than drying out in the open heat.